How to reduce the heat of A3977 stepper driver?

[krunal_299]

Hi guys!!!
I have a small board of stepper motor controller which uses A3977(allegro) as driver chip.
Running parameter: 1/8 microstep, set for 0.8A current.
And motor is rated for 0.86 A of current.
My problem is during stand still motor gets appreciateably hot.
What should be done to reduce the motor heating?
Any help will be appreciated heartly.
Regards!!!

 

[FvM]

a3977 board

This behaviour is by design! It happens, when you set operating current nearly to motor maximum capacity. With 3977, you can only decrease Vref to a lower idle level, e. g. by voltage divider and a switch transistor.

 

[krunal_299]

a3977 driver

During stan still position, both phase of the motor are ON.
Is it possible with A3977 to keep only one phase ON in standstill position?

 

[kingssk]

Hi guys!!!
I have a small board of stepper motor controller which uses A3977(allegro) as driver chip.
Running parameter: 1/8 microstep, set for 0.8A current.
And motor is rated for 0.86 A of current.
My problem is during stand still motor gets appreciateably hot.
What should be done to reduce the motor heating?
Any help will be appreciated heartly.
Regards!!!

I am also have the same problem but in my case motor is rated for 1A, device is not getting heat, but in some case its failed,
Please any one help me

 

[dr pepper]

If you dont need the motor to hold a load when it is at a standstill then disable the driver chip and shut down all power consumption at standstill.

 

[Maggie888]

Why not try another chip THB6064AH ,which built-in thermal shutdown(TSD) and over-current detection(ISD) circuit?